mirror of https://github.com/acidanthera/audk.git
328 lines
7.8 KiB
C
328 lines
7.8 KiB
C
/** @file
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Implementation of translation upon VT-UTF8.
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Copyright (c) 2006, Intel Corporation. <BR>
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All rights reserved. This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "Terminal.h"
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/**
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Translate all VT-UTF8 characters in the Raw FIFI into unicode characters,
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and insert them into Unicode FIFO.
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@param TerminalDevice The terminal device.
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@return None.
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**/
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VOID
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VTUTF8RawDataToUnicode (
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IN TERMINAL_DEV *TerminalDevice
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)
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{
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UTF8_CHAR Utf8Char;
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UINT8 ValidBytes;
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UINT16 UnicodeChar;
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ValidBytes = 0;
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//
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// pop the raw data out from the raw fifo,
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// and translate it into unicode, then push
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// the unicode into unicode fifo, until the raw fifo is empty.
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//
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while (!IsRawFiFoEmpty (TerminalDevice)) {
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GetOneValidUtf8Char (TerminalDevice, &Utf8Char, &ValidBytes);
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if (ValidBytes < 1 || ValidBytes > 3) {
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continue;
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}
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Utf8ToUnicode (Utf8Char, ValidBytes, (CHAR16 *) &UnicodeChar);
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UnicodeFiFoInsertOneKey (TerminalDevice, UnicodeChar);
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}
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}
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/**
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Get one valid VT-UTF8 characters set from Raw Data FIFO.
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@param Utf8Device The terminal device.
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@param Utf8Char Returned valid VT-UTF8 characters set.
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@param ValidBytes The count of returned VT-VTF8 characters.
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If ValidBytes is zero, no valid VT-UTF8 returned.
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@retval None.
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**/
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VOID
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GetOneValidUtf8Char (
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IN TERMINAL_DEV *Utf8Device,
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OUT UTF8_CHAR *Utf8Char,
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OUT UINT8 *ValidBytes
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)
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{
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UINT8 Temp;
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UINT8 Index;
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BOOLEAN FetchFlag;
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Temp = 0;
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Index = 0;
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FetchFlag = TRUE;
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//
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// if no valid Utf8 char is found in the RawFiFo,
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// then *ValidBytes will be zero.
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//
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*ValidBytes = 0;
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while (!IsRawFiFoEmpty (Utf8Device)) {
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RawFiFoRemoveOneKey (Utf8Device, &Temp);
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switch (*ValidBytes) {
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case 0:
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if ((Temp & 0x80) == 0) {
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//
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// one-byte utf8 char
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//
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*ValidBytes = 1;
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Utf8Char->Utf8_1 = Temp;
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FetchFlag = FALSE;
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} else if ((Temp & 0xe0) == 0xc0) {
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//
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// two-byte utf8 char
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//
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*ValidBytes = 2;
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Utf8Char->Utf8_2[1] = Temp;
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} else if ((Temp & 0xf0) == 0xe0) {
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//
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// three-byte utf8 char
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//
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*ValidBytes = 3;
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Utf8Char->Utf8_3[2] = Temp;
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Index++;
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} else {
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//
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// reset *ValidBytes to zero, let valid utf8 char search restart
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//
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*ValidBytes = 0;
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}
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break;
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case 2:
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if ((Temp & 0xc0) == 0x80) {
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Utf8Char->Utf8_2[0] = Temp;
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FetchFlag = FALSE;
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} else {
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*ValidBytes = 0;
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}
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break;
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case 3:
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if ((Temp & 0xc0) == 0x80) {
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Utf8Char->Utf8_3[2 - Index] = Temp;
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Index++;
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if (Index == 3) {
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FetchFlag = FALSE;
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}
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} else {
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*ValidBytes = 0;
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Index = 0;
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}
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break;
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default:
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break;
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}
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if (!FetchFlag) {
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break;
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}
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}
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return ;
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}
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/**
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Translate VT-UTF8 characters into one Unicode character.
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UTF8 Encoding Table
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Bits per Character | Unicode Character Range | Unicode Binary Encoding | UTF8 Binary Encoding
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0-7 | 0x0000 - 0x007F | 00000000 0xxxxxxx | 0xxxxxxx
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8-11 | 0x0080 - 0x07FF | 00000xxx xxxxxxxx | 110xxxxx 10xxxxxx
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12-16 | 0x0800 - 0xFFFF | xxxxxxxx xxxxxxxx | 1110xxxx 10xxxxxx 10xxxxxx
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@param Utf8Char VT-UTF8 character set needs translating.
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@param ValidBytes The count of valid VT-UTF8 characters.
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@param UnicodeChar Returned unicode character.
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@return None.
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**/
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VOID
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Utf8ToUnicode (
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IN UTF8_CHAR Utf8Char,
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IN UINT8 ValidBytes,
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OUT CHAR16 *UnicodeChar
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)
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{
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UINT8 UnicodeByte0;
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UINT8 UnicodeByte1;
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UINT8 Byte0;
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UINT8 Byte1;
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UINT8 Byte2;
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*UnicodeChar = 0;
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//
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// translate utf8 code to unicode, in terminal standard,
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// up to 3 bytes utf8 code is supported.
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//
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switch (ValidBytes) {
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case 1:
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//
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// one-byte utf8 code
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//
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*UnicodeChar = (UINT16) Utf8Char.Utf8_1;
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break;
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case 2:
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//
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// two-byte utf8 code
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//
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Byte0 = Utf8Char.Utf8_2[0];
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Byte1 = Utf8Char.Utf8_2[1];
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UnicodeByte0 = (UINT8) ((Byte1 << 6) | (Byte0 & 0x3f));
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UnicodeByte1 = (UINT8) ((Byte1 >> 2) & 0x07);
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*UnicodeChar = (UINT16) (UnicodeByte0 | (UnicodeByte1 << 8));
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break;
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case 3:
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//
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// three-byte utf8 code
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//
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Byte0 = Utf8Char.Utf8_3[0];
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Byte1 = Utf8Char.Utf8_3[1];
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Byte2 = Utf8Char.Utf8_3[2];
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UnicodeByte0 = (UINT8) ((Byte1 << 6) | (Byte0 & 0x3f));
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UnicodeByte1 = (UINT8) ((Byte2 << 4) | ((Byte1 >> 2) & 0x0f));
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*UnicodeChar = (UINT16) (UnicodeByte0 | (UnicodeByte1 << 8));
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default:
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break;
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}
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return ;
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}
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/**
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Translate one Unicode character into VT-UTF8 characters.
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UTF8 Encoding Table
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Bits per Character | Unicode Character Range | Unicode Binary Encoding | UTF8 Binary Encoding
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0-7 | 0x0000 - 0x007F | 00000000 0xxxxxxx | 0xxxxxxx
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8-11 | 0x0080 - 0x07FF | 00000xxx xxxxxxxx | 110xxxxx 10xxxxxx
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12-16 | 0x0800 - 0xFFFF | xxxxxxxx xxxxxxxx | 1110xxxx 10xxxxxx 10xxxxxx
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@param Unicode Unicode character need translating.
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@param Utf8Char Return VT-UTF8 character set.
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@param ValidBytes The count of valid VT-UTF8 characters. If
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ValidBytes is zero, no valid VT-UTF8 returned.
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@return None.
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**/
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VOID
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UnicodeToUtf8 (
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IN CHAR16 Unicode,
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OUT UTF8_CHAR *Utf8Char,
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OUT UINT8 *ValidBytes
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)
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{
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UINT8 UnicodeByte0;
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UINT8 UnicodeByte1;
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//
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// translate unicode to utf8 code
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//
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UnicodeByte0 = (UINT8) Unicode;
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UnicodeByte1 = (UINT8) (Unicode >> 8);
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if (Unicode < 0x0080) {
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Utf8Char->Utf8_1 = (UINT8) (UnicodeByte0 & 0x7f);
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*ValidBytes = 1;
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} else if (Unicode < 0x0800) {
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//
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// byte sequence: high -> low
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// Utf8_2[0], Utf8_2[1]
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//
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Utf8Char->Utf8_2[1] = (UINT8) ((UnicodeByte0 & 0x3f) + 0x80);
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Utf8Char->Utf8_2[0] = (UINT8) ((((UnicodeByte1 << 2) + (UnicodeByte0 >> 6)) & 0x1f) + 0xc0);
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*ValidBytes = 2;
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} else {
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//
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// byte sequence: high -> low
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// Utf8_3[0], Utf8_3[1], Utf8_3[2]
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//
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Utf8Char->Utf8_3[2] = (UINT8) ((UnicodeByte0 & 0x3f) + 0x80);
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Utf8Char->Utf8_3[1] = (UINT8) ((((UnicodeByte1 << 2) + (UnicodeByte0 >> 6)) & 0x3f) + 0x80);
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Utf8Char->Utf8_3[0] = (UINT8) (((UnicodeByte1 >> 4) & 0x0f) + 0xe0);
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*ValidBytes = 3;
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}
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}
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/**
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Check if input string is valid VT-UTF8 string.
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@param TerminalDevice The terminal device.
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@param WString The input string.
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@retval EFI_SUCCESS If all input characters are valid.
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**/
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EFI_STATUS
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VTUTF8TestString (
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IN TERMINAL_DEV *TerminalDevice,
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IN CHAR16 *WString
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)
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{
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//
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// to utf8, all kind of characters are supported.
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//
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return EFI_SUCCESS;
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}
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